1. Bluetooth 4.1 version, the effective distance up to 10m, it could build faster connection and transmit stable signal in high speed. 2. Come with an 450mAh intelligent charger box, it is a storage box as well as a charger. Put the earphone in it and close the lid, it would charge the earphone automatically. 3. Dual Bluetooth earbuds, the right one is the main earphone, they would turn into double channel stereo mode when connect with the phone. You could use it in single or together. 4. Intelligent voice prompt, it could indicate you the real-time state of the earphone, such as low battery, successful connection, power on or off and etc. 5. Lightweight, mini size, you will feel comfortable in ears. 6. Strong compatibility, it could compatible with most of Bluetooth devices. Besides, this earphone support simultaneous connection with two bluetooth devices.